Fix depdendencies for gendoc.

doc/d-utils.md

@@ -388,6 +388,16 @@ quoted-printable sequences.
 Returns the ```str``` with all characters converted to upper case
 using ```char-upcase```. Does not work with UTF-8.
 
+### string-capitalize [procedure]
+
+    (string-capitalize str)
+
+* ```str``` - arbitrary string
+
+Returns the ```str``` with the first character converted to upper case
+using ```char-upcase``` and the remainder converted to lower case
+using ```char-downcase```. Does not work with UTF-8.
+
 ## util-mail [module]
 
     (import util-mail)